Question about 1986 Yamaha RD 350

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Hello, I am ali from india, thanks for providing this excellent oppurtunity to share problems. i have a 1984 indian model yamaha rd 350. recently i took the job of restoring it completly. in the process of collecting the spares i happen to come across the **** type upper l shape ring pistons. well after completing the reboring job from experts i was told it would give maximum performance compared to ordinary pistons. the reboring was done using comany specified mesures. but sadly after the finish and run we are facing lots of problems from this pistons. firstly it is causing lots of vibrations in mid range causing to siezure of pistons twice. not major once. secondly the tuning is not comming to standards even after trying it from company experts. every one is confused. we are using the company supplied original spares imported from U.S. markets, all are genuine spares,but still not getting satisfied results. please if possible provide the help needed. thank you agian

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You need to check clearance betwween piston and bore.It should be 1 1/2 thou clearance at the base(widest part)of piston.If it is less than this or more than 2 thou (0.002")then you will get problems.

Make sure it has been bored properly and that bore diameter is the same throughout the length.

Ring gaps should be about 7 thou,and no less or you will get seizing.

If you have a powervavle it should be set correctly too.I raced RD 350s for nearly 10 years and there is so much you can do but it can take time, but I will help you if you are interested.I could give you starting points for tuning if you can tell me carb size,whether you have expansion pipes,airfilter type etc ,etc.Oh dond forget not to fit plugs that are too hot like a bp6hs etc. as you can hole your piston too.

In the mean time check the piston,bore and rings and get back to me if you need more help.

Posted on Sep 11, 2009

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Model: Yamaha RD 350 Year: 1986 Category: Classic Rating: 76.9 out of 100. Show full rating and compare with other bikes Engine and transmission Displacement: 347.00 ccm (21.17 cubic inches) Engine type: Twin, two-stroke Power: 63.00 HP (46.0 kW)) @ 9000 RPM Top speed: 190.0 km/h (118.1 mph) Compression: 6.0:1 Bore x stroke: 64.0 x 54.0 mm (2.5 x 2.1 inches) Fuel control: Membrane & power valve Cooling system: Liquid Gearbox: 6-speed Transmission type,
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Chain Chassis, suspension, brakes and wheels Front tyre dimensions: 190/90-18 Rear tyre dimensions: 110/80-18 Front brakes: Dual disc Rear brakes: Single disc Physical measures and capacities Weight incl. oil, gas, etc: 170.0 kg (374.8 pounds) Fuel capacity: 20.00 litres (5.28 gallons) Other specifications Further information Parts and accessories Our partner CMSNL ships low cost OEM motorcycle partsimage-1696787-10826297 to Australia, Austria, Bahamas, Belgium, Canada, China, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hong Kong, Hungary, Iceland, India, Ireland, Italy, Japan, Kuwait, Latvia, Lithuania, Luxembourg, Macedonia, Malta, Montenegro, The Netherlands, New Zealand, Norway, Poland, Portugal, Serbia, Slovakia, Slovenia, South Africa, Spain, Sweden, Switzerland, Taiwan, Ukraine, United Kingdom, The United States and more. Or check out parts and accessories from our other partners.

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